Charles e



(No Modl.) I

G. E. DRESSLER. ELEGTRIG MOTOR 0R DYNAMO ELECTRIC MAGHINE.

N0..442,173. Patented Dec. 9, 1890.

I Wh tman aw v UNITED STATES.

PATENT OFFICE.

CHARLES E. DRESSLER, OF NEWV YORK, N. Y.

ELECTRIC MOTOR OR DYNAMO-ELE CTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 442,173, dated December9, 1890.

Application filed April 14, 1890. Serial No. 347,91'7- (No model.)

To all? whom it may concern.-

13 c it known that 1, CHARLES E. DRESSLER,

of'the city of New York, in the county and State of New York, haveinvented a new and useful Electric Motor or Dynamo -Electric Machine,which invention is fully set forth and illustrated in the followingspecification and accompanying drawings.

The object of this invention is sufficiently indicated in its titleabove given.

The invention will first be described in detail, and then particularlyset forth in the claims.

In the accompanying drawings, Figure 1 shows the machine incross-section at right angles to its axis of rotation. Fig. 2 shows themachine in sectional elevation, with the armature withdrawn from betweenthe outer and inner field-magnets.

In saidfigures the several parts are indicated by reference letters andnumbers as follows:

An outer magnetic field is obtained by the annular arrangement of fourpole-pieces 1, forming quadrantal sections of a stationary cylinder tiedtogether through one diameter at the field-coils 2 and at the otherdiameter by straps or bars 3, of nonmagnetic material. An inner magneticfield is obtained by four quadrantal'pole-pieces 4, formed of two fixedsemi-cylinders provided with coils 5. Ahollow cylinder-armature 6,provided with coils c, is annularly interposed to rotate between saidinner and outer magnetic fields.

The parts marked with the letters N and S have north and south polaritycorrespond ing, respectively, with that indicated by said initialletters.

The pole-pieces l are spaced apart to 1'e ceive the coils 2 by means ofthe field-cores 7, of magnetic material, into which cores are tapped thebolts 8 through the pole-pieces. Bolts 9, through the straps 3, aretapped into the polepieces 1, so that the outer field-magnets arethoroughly secured together and may be secured in any suitable manner toany suitable foundation or bed-plate. The

semi-cylindrical inner pole-pieces 4c are con nected together in pairsby cores 10, which cores may be integral with their respectivepole-pieces, a suflicient zone of space being allowed to be filled'withthe coils 5, excepting a central space for the driving or armature shaft11, whose connection with the armature and the armature itself willpresently be described. The inner fieldpole-pieces 4 are suitablysecured by bolts 12 or otherwise to the flange 13 of a sleeve 14, whichsleeve is immovably secured by set-screws 15 or otherwise in apillow-block or bearing-block 16, which latter may be secured in anysuitable manner to thebed-plate of the machine.

The armature 6 is composed of a series of annular disks a, preferablybolted together, so as to form'a hollow cylinder, by bolts 11, -passingthrough holes 6, and by the same bolts or otherwise to a disk (1, ofnon-magnetic material, secured fast to the driving or armature shaft 11.Said shaft is journaled at one end in the sleeve 14 and at its other endin a suitable bearing 17, secured to the bed-plate of the machine. Thecommutator O is secured in any suitable manner to the shaft 11, eitherdirectly or to the disk (1, as may be preferred. The armature-coils care wound radially and longitudinally of the armature through holes h inany number desired or best suited to the size of the machine. Said coilsmay be made of iron wire insulated such as cotton or silk-and besidesbeing cheaper than if of either copper or brass wire they form part ofthe whole mass of the ar mature to be attracted by the field, while atthe same time serving as the energizing or exciting media for said wholemass. These coils of iron wire will be effective in the machine if it beused as a dynamo, but are of more advantage when the machine is used asa motor. It is obvious that these coils and the bolts b 1n ntually actto re-enforce each other in securing the laminae or disks a together;but the bolts may be omitted, if desired, the coils having strengthenough in themselves to hold the laminae together independently of saidbolts. The coils of the field-magnets are to be connected in the usualwell known man ner to a dynamo, battery, or other suitable primarysource of electricity and the arma ture coils to the same or a similarelectric source and to the commutator in a manner well known to thoseskilled in the art, and therefore not needing explanation here.

This machine only needs to be run by by any suitable or usual insulatingmaterial-- IOC power to become a dynamo or generator of electricityinstead of a transmitter of power or motor.

It will be observed that in the field-magnets the poles of like polarityare brought into very close proximity, and as they mutually repel eachother the tendency is to concentrate a greater attractive force at theiropposite poles or unlike poles, which increased attractive force adds tothe economic performance, whether the machine be used as a motor todrive the armature or as a dynamo to generate electricity by theforcible driving of the armature by external power. The 0011- structionof the armature is such that it is obvious that the quantity of wireused therefor may be indefinitely increased without soparating any ofthe pole-pieces farther apart. Coarser wire can also be used for thispurpose than that commonly used heretofore, thus lessening danger ofburning tl16lI1Slllated covering of the wires or the wires themselves.

Having thus fully described my said invention, I claim- 1. In anelectric motor ordynamoanaehine, in combination with an outer armature,a fieldmagnet within the same composed of cylindrical sectors of likepolarity connected to sectors of opposite polarity by cores wound withexciting-coils of insulated wire within a zone separating said sectors,substantially as and for the purposes set forth.

2. In an electric motor or dynamoanachinc, the combination of outer andinner field-magnets annular-1y located and an interposed armature, theouter field-1nagnet composed of cylindrical arcs connected in pairs, aspoles ofopposite polarity, by end cores wound with exciting-coils ofinsulated wire,sai d pairs being intermediately divided to form adjacentpoles of similar polarity, and the inner field magnet composed ofcylindrical sectors of like polarity connected to sectors of oppositepolarity by cores wound with exciting-coils of insulated wire within azone separating said sectors, substantially as and for the purposes setforth.

3. In an electric motor or dynamomaehine, the combination of outer andinner field-magnets annularlylocated and an interposed openendedarl'nature, the inner field-magnet scoured to a sleeve mounted on apillow-block or standard and serving as a bearing for tho armature-journal, substantially as and for the purposes set forth.

In an electric motor or d Yljltll10-l11l0l1lll, an annular armaturecomposed of a scries of annular disks secured together by bolts andprovided with coils of insulated wire wound in longitudinal slotsradially in line on the same side of the center of thear1.nature,substantially as and for the purposes set forth.

5. In an electric motor or dynamo-machine, a series of annular disks ofiron magnetically insulated from each other and secured together bybolts, so as to form an'annular armature-core, and provided withexciting-coils of insulated wire longitudinally wound through slotsinsaid disks in radial lines on the same side of the center of thearmature, substantially as and for the purposes set forth.

(5. In an electric motoror dynamomachinc, in combination with outer andinner fieldmagnets annular] y located, a series of annular disks securedtogether so as to form an interposed annular armature-core by coils ofinsulated wire longitudinally wound through slots in said disks inradial lines between the outer and inner fieldanagnets, substantially asand for the purposes set forth.

CHARLES E. DRESSLIiJi'i. Witnesses:

FRANCIS P. REILLY, THEO. ll. FRIEND.

